Specifications

TN775C maintenance
Issue 6 February 2007 237
● All R system PPNs. A critical reliability R system requires a TN771DP circuit pack in each
EPN. An R system with ATM network duplication requires a TN771DP circuit pack in each
PPN and EPN.
● All CSI models that use a TN2198 BRI circuit pack
A maximum of one TN771DP circuit pack is allowed in any port network.
A TN771DP circuit pack is never used with the S8100 Media Server.
TN775C maintenance
Note:
Note: This circuit pack is not used in a G650 Media Gateway.
The TN775C circuit pack is used in maintenance to monitor power failure signals in an
expansion port network (EPN) cabinet. The TN775C circuit pack also monitors the clock,
monitors and controls the power supplies and battery charger, and monitors air flow and
high-temperature sensors. The TN775C circuit pack provides two serial links to communicate
with Expansion Interface (EI) circuit packs. The TN775C also provides an RS-232 interface for
connection to an administration terminal. Each circuit pack contains a 3-position switch to
control emergency power transfer.
The TN775C contains a DC-to-DC power converter. The TN775C is used in maintenance to
monitor the processor in an EPN. A Survivable Remote Processor (SRP) supports this EPN.
TN780 tone clock
Note:
Note: This circuit pack is no longer sold.
The TN780 tone clock circuit pack connects to and monitors an optional external stratum-3
clock for digital frame timing. The TN780 circuit pack also couples the clock output to local
clocks. The TN780 circuit pack supplies master timing to the system and produces the
following:
● call-progress tones
● touchtones
● answer-back tones
● trunk-transmission test tones